re-wiring studio from ground up to see if I can seperate the audio and power lines but it has made no difference at all.

I have a pc, win xp, have tried multiple usb ports. even have bad noise thru desk when the channel that the audio lead from the engine is connected to is muted but again disconnect usb (G2) problem gone.

Didn´t you say you had a G4?_________________A Charity Pantomime in aid of Paranoid Schizophrenics descended into chaos yesterday when someone shouted, "He's behind you!"

Do you have a CRT or an LCD display? Is the USB cable running close to the CRT? Is the G2 or the desk or the audiointerface close to a CRT?_________________A Charity Pantomime in aid of Paranoid Schizophrenics descended into chaos yesterday when someone shouted, "He's behind you!"

What else is connected to the computer? Do you have a WiFi card or something like that?_________________A Charity Pantomime in aid of Paranoid Schizophrenics descended into chaos yesterday when someone shouted, "He's behind you!"

...i would try grounding the signal ground of the computer. run a wire from any metal connector shield of the computer (ie, the printer port screw terminal) to a known ground (metal center screw of a switchplate). do this with all power off (in case there is a problem with the computer powersupply). it's probably worth trying both with the computer plug grounded and lifted.

Isn´t the Ozonic either powered by the FW bus or a 12 volt external PSU?

M-Audio usually says : NEVER use the external PSU if the FW bus can deliver the juice. If the cable has that "big" FW plug in both ends, then it can power the Ozonic. Check the manual._________________A Charity Pantomime in aid of Paranoid Schizophrenics descended into chaos yesterday when someone shouted, "He's behind you!"

Ozonic is powered by FW as you say, altho i did try it off it's own power supply too but no change, altho switching the ozonic off but leaving it connected via firewire kills the noise coming thru the desk. So it would imply that it is the data and/or power transfer on usb nord or FW ozonic that is the problem.

toying with the idea of moving the firewire card in pc away from the graphics card, it just seems odd that this problem would only show up when the usb on the nord was also connected, as i have other usb devices which have provided no such problems.

I was expecting a high pitched noise, this seems more like a soft kind of good old fashioned motor boating or something.

My USB / G2 gives a high pitched noise that disappears when I shut down the editor or remove the G2's USB cables. When I start the editor I can clearly hear the USB negotiation process as well.

I can't record this noise though (which would be nice for comparison), when I try it's gone ... I mean it's still there in the speakers but not in the recording._________________Jan
(yawning shifts perceived pitch, making things more interesting)

it just seems odd that this problem would only show up when the usb on the nord was also connected

It's s not as strange as it might seem as the signals are not going through the cables as expected. I'd certainly give it a try to move the video and audio cards apart._________________Jan
(yawning shifts perceived pitch, making things more interesting)

Please forgive me for thread resurrection, but I'm experiencing this same problem on a G2 I just picked up off of Ebay. Soundwise it's great, but when both the USB & and Audio are plugged in, it's pretty unusable. The noise is coming out the interface (a MOTU ultra lite), but it is NOT apparently on the audio outs of the G2. Rather it is coming back on the internal "computer audio" channel right out the mains. when I switch tasks, or open a web page (anything with some comp "work" going on) the sound reflects the work.

I've tested with both balanced and unbalanced cables. The computer is a macbook pro which is powering the audio IO over the firewire bus. Popping out the power connection makes no impact on the sound.

I was going to cut the ground on one end of a pair of unbalanced cables, but the only unbalanced I have left have the cheap plastic perma-molding so I don't have access to the wires.

Any ideas on this? The laptop does have the ground plug in the wall, but as I said I unplugged the cable altogether and it didn't make any difference. Similarly, plugging the G2 and the computer into the same power strip did not make a difference.

This isn't the normal 60hz hum that I'd use a groundlift plug for.. it is very frustrating though :/ Not sure if I have the will to mess with this if it is going to stay this way, please help if you can.. All input greatly appreciated. let me know what data I need to fill in to describe the situation. Obviously since this one has been in use since Aug 2006, sending it back to the suppliers for a replacement isn't an option.

I take back what I just said. The G2 sounds too good (when the USB is not plugged in) to just get rid of, nevermind the programming. I assert that I am about 99% sure if I find some unbalanced cables which actually give me access to the hardware (I don't have the stuff on me to make one), and I snip the shield on one end, that the loop will go away.

Who's with me!?

this is sparta! or something :/

intro post coming once I am comfortably set up. G1 mod is now sitting behind the rack, possibly becoming a for sale item.

Well yes, and besides it's not something Clavia will be able to fix I'm affraid ... both USB and audio "specify" ground loops ... I give you about 75% that cutting the audio grounds resolves the problem ... 10% that it get worse ...

These are tough problems and I'm glad that I don't have it anymore since I hooked up th G2s to another computer and started using the RME interface ... maybe a galvanic isolated unbalanced to balanced converter would do the trick._________________Jan
(yawning shifts perceived pitch, making things more interesting)

I'm kind of thinking that it isn't that urgent. I mean, it isn't like I have to have the Editor running every time I use the synth ... and more importantly, considering I have two kids (one being not 2 months old yet), my audio levels are frequently restricted. If I turn down the mains on the Ultralite to a "reasonable" level, I can't hear the USB noise (or at least, let's say, when there is audio being produced, the s/n ratio is acceptable).

However, I will get a test unbalanced cable and snip the shield off sometime soon and report back whether it's in the 75% or 10% ... or the 15% where suddenly the thing programs itself!

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